Look Ma, No Hands!

I generally use ATF cut with acetone, which he mentioned, because it's the cheapest thing going--I don't have to feel guilty about slathering it on a badly stuck headset or seatpost. A half-gallon of the witches' brew will set you back less than the cost of one small can of name-brand stuff. I apply it using a plastic ketchup bottle I bought at the dollar store.

Wore out three sets of tires already!

I generally use ATF cut with acetone, which he mentioned, because it's the cheapest thing going--I don't have to feel guilty about slathering it on a badly stuck headset or seatpost. A half-gallon of the witches' brew will set you back less than the cost of one small can of name-brand stuff. I apply it using a plastic ketchup bottle I bought at the dollar store.

Look Ma, No Hands!

I'm surprised acetone is compattable with a dollar store ketchup bottle, learn something everyday. I mix mine 50/50. I use a bottle with a little flip spout to keep the acetone from evaporating to much, I paid dearly for the bottles, they are Nalgene, had no idea dollar store bottles would work. Allways wanted to try Marvel Mystery and acetone mix, wonder how that would work?

Look Ma, No Hands!

I usually cut my mix roughly 50/50, but could probably go lighter on the acetone...the more solvent you use, the more likely it is to attack plastic, rubber, and other materials the mixture ought to be kept from. I would not recommend brake fluid because I spilled some once and took a big splotch of paint off the car fender. Marvel Mystery Oil is probably suitable, but I haven't tried it only because it costs significantly more than bargain brand ATF.

I've kept mine stored in the same squeeze bottle since 2014 and it has held up fine--the plastic does not seem to be affected. You will, however, have to fashion some sort of seal at the lid to keep things from leaking at that joint. I simply cut out a perforated disk from a piece of old inner tube and wrapped the cap tightly with a zip-tie to help make sure it stays firmly in place.

Wore out three sets of tires already!

Machinist's Workshop magazine actually tested penetrants for break out
torque on rusted nuts. Significant results! They are below, as
forwarded by an ex-student and professional machinist, Bud Baker.
*Don't forget the April 2007 "Machinist's Workshop" magazine comparison
test.*
*They arranged a subjective test of all the popular penetrants with
the control being the torque required to remove the nut from a
"scientifically rusted" environment.*

*The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic
transmission fluid and acetone.*
*Note the "home brew" was better than any commercial product in this one
particular test. Our local machinist group mixed up a batch and we all
now use it with equally good results. Note also that "Liquid Wrench" is
about as good as "Kroil" for about 20% of the price. *

I'm the Wiz, and nobody beats me!

Machinist's Workshop magazine actually tested penetrants for break out
torque on rusted nuts. Significant results! They are below, as
forwarded by an ex-student and professional machinist, Bud Baker.
*Don't forget the April 2007 "Machinist's Workshop" magazine comparison
test.*
*They arranged a subjective test of all the popular penetrants with
the control being the torque required to remove the nut from a
"scientifically rusted" environment.*

*The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic
transmission fluid and acetone.*
*Note the "home brew" was better than any commercial product in this one
particular test. Our local machinist group mixed up a batch and we all
now use it with equally good results. Note also that "Liquid Wrench" is
about as good as "Kroil" for about 20% of the price. *

I live for the CABE

Machinist's Workshop magazine actually tested penetrants for break out
torque on rusted nuts. Significant results! They are below, as
forwarded by an ex-student and professional machinist, Bud Baker.
*Don't forget the April 2007 "Machinist's Workshop" magazine comparison
test.*
*They arranged a subjective test of all the popular penetrants with
the control being the torque required to remove the nut from a
"scientifically rusted" environment.*

*The ATF-Acetone mix was a "home brew" mix of 50 - 50 automatic
transmission fluid and acetone.*
*Note the "home brew" was better than any commercial product in this one
particular test. Our local machinist group mixed up a batch and we all
now use it with equally good results. Note also that "Liquid Wrench" is
about as good as "Kroil" for about 20% of the price. *

Finally riding a big boys bike

If you keep it in an enclosed can, like an oiler or those described above, it should be fine to store. Just remember to shake it up before each use, acetone and ATF don't stay mixed for long. If you store it and notice that your mixture is a little heavy, you'll just need to add some more acetone, it will evaporate over time. Be sure keep it away from painted surfaces, the acetone will strip paint.